How to get indexed by llm through llms.txt file?

Getting indexed by an LLM through an llms.txt file starts with creating the file itself, a plain Markdown document placed at the root of your domain, structured with a clear title, a short summary of your site, and organized links to your most valuable pages, like documentation, key articles, or product information. Beyond simply creating the file, you need it to actually be read, which depends on whether the specific AI system or crawler you're targeting supports the llms.txt convention at all, since adoption is still inconsistent across different AI companies and tools. It also helps to keep the content genuinely useful and current, avoiding filler and prioritizing the pages that best represent what your site offers, since AI systems are looking for signal, not volume. Beyond the file itself, being 'indexed' by an LLM in any meaningful sense usually still depends on broader factors like whether your content appears in training data, whether your site is crawlable through your robots.txt settings, and whether your content is clear and well-structured. Treat llms.txt as one piece of an overall AI visibility strategy rather than a guaranteed ticket to being referenced.